Manhole frame and cover



L. GSCHWIND.

MANHOLE FRAME AND COVER.

APPLlcATloN man JUNE 7.1920.

1,417,377. Patented May 2351922.

repeats LEON GSCHWND, F YOUNGS'EOVJN, OHM), ASSIGNOR TO MORRIS BONNEVIE,0F

` CHICAGO, ILLINOIS.

MANHOLE FRAME AND COVER.

ygpgffgy? Speciicaton of Letters atent. Pateulgd Rigby 239 1922.

Application filed June 7', 1920. Serial No. 387,267.

`provide a device of the type described in which means is provided forlocking the cover in position, means also being provided `to permit theunlocking` ot the cover-.at will.

'further object of my invention is to provide a `device of the typedescribed that ,is thoroughly practical commercially.

Other objects and advantages willappear in the following` specification,andthe novel teatures ot the invention will be particularly pointed outin the appended claim.

YMy invention is illustrated in the accompanying (,lrawings, formingpart otthis application, in which- Fig. fl is a plan view of the devicein operative pogirtion7 Fig. 2 isa section along the line 2 2 ot Fia l.

Fig. 8 is a bottom plan view ot a portion of the device, n Fig.l 4: is a.plan view oi a kportion oil' the device,

Fig. 5 is a section along the line 5 5 ot Fig. 4,

Fig. 6 is a sectional view of a fragmentary portion of a modiiied formoit the device.

ln carrying out my invention l provide a cylindrical outer trame member1, which is formed with an outwardly extending` flange 2 at its lowerend. The trame member 1 is adapted to be embedded in concrete 3 or thelike about an opening 4 in the manner pictured in Fig. 2 ot theaccompanying drawings. It will be noted that the flange 2 serves as ananchor for the device.

The outer trame member 1 is fashioned with a plurality of angularabutments 5 which project inwardly. The abutments are located at spaceddistances apart around the inner wall of the trame member 1 adjacent thelower end thereof and are Jformed with their inclined upper edgeprovided with .respect thereto.

`tion 11 ot' the inner trame 7.

rounded teeth G, as clearly shown in the drawings.

' A second or inner trame member 7 which also cylindrical in shape, is:formed with angular prolongations 8 which extend downwardly from itslower end. it will be noted that the inclined lower edge ot the angularprolongations 8 are provided with rounded teeth 9 which are arranged tomesh with the rounded teeth G ot the angular abutments 5. whereby thesecond trame member 7 is supported by the trarne member 1 and isadjustable vertically with The trame member 7 is Yformed with aninwardly extending annular rib 10 which is located near its upper end.The inner wall ot' the trame member 7 above the annular' rib 10 isbeveled at 11, as best seen in Fig. 2.

A. cover or lid portion 12, which is preterably olf the shape shown inthe drawings. is adapted to close the upper end ot the Jframe member 7,being seated upon the annular rib l0.. The edge of the cover 12 isbeveled at 1.8 to assure a close tit with the beveled por The cover' 12may be molded or formed with its upper surface plain or ornamented withany desired design. The under surface ot the cover 12 is provided withradially extending tapering ribs 14 which greatly strengthen. the same.

A, boss 15 formed with a slot or recess 16, adapted to receive theannular-.rib 10. is 'formed integrally with the cover 12, as best seenin Fig. 2 ot the drawings. It is obvious that the boss 15 may be Jformedseparately trom the cover 12 and secured to the under surface thereof inany suitable manner, as by welding.

In order to securely maintain the cover 12 in position to close theframe 7 I provide a locking device that is adapted to cooperate with theboss 15. In attaining this object I provide-a bolt or pin 17 whichextends through the cover 12 at a point diametrically opposite to theboss 15. A bar 18 is rigidly secured to the lower end of the bolt or pin17 in any suitable manner, as by passing a pin 31 transversely throughthe bolt 17 and the bar 18. A nut 1 9 is screwed on the end of the bolt17 to further prevent displacement of the bar 18. The outer end of thebar 18 is connected with the inner end of a second Clt bar by ineans of:i bolt 2l and a nut 22.

.he bolt 2l acts as a pivot about which the bar 2O may be inoved. Thebar 20, which serves as the bolt in the fastening` device, extendsthrough a tl-sliaped retaining inernber or keeper 23 which is torinedintegrally with the cover l2 or ina-y be rigidly secured to the undersuriace thereof in any suitable manner, as by welding. lt is to be notedthat the end of the bar 20 is in position to engage the under side otthe annular rib l0 when the locking device is in the position picturedin 2 and consequently, since the annular rib l() at a diainetricallyopposite point is engaged by the slot 1G in the boss l5, the cover 12 issecurely maintained in position. A ring 24; is connected with the upperend of' the pin 17 to present a convenient means tor operating' thelocking device. A i'ecess 25 is provided in the upper surface ot thecover l2 to receive the ring 24.

.ln the modified forni of the device, a fragmentary portion ot which ispictured in Fig. G of the accoinpanyingdrawings, the pin i7 is torinedwith a squared upper end l2 which is adapted to receive a ley or thelike (not shown) such as is ordinarily used in operating' units ot Waterworks plants, since it is sometimes desired to operate the lockingdevice by ineans of such a key. V

.fin eye bolt 26 extends through the center ot the cover l2 and has anut 27 screwed on its lower end. lts upper end, which is formed into aneye 29, connects 'with aring 28 which is normally disposed in a recess30 which is provided in the upper surface ot the cover l2. The ring` 2Sis provided to 'facilitate the removal ot the cover l2 troni the traine7,' since the ring various part-s ot the device, the operation thereofmay be readily understood and requires no detailed description. Thelockingdevice described in the foregoing is operated by rotating the pinor bolt l?. Since the bar lS has a pivotal connection with the inner endof the bar 20, which is thel latching bolt of the device, rotation ofthe pin 17 will occasion a inovernent of the ba-r 2O toward the centerot the cover l2 until the end ot the bar 2O no longer engages the underside of the annular rib l0. The cover l2 may then be removed from thetrarne member' 7.

`One oi the advantages of the device lies in the extensible featurel ofthe same. lt is obvious that when the inner traine inember is rotatablynioved, the rounded teeth 9 will successively engage the rounded teethG, thereby causing` the upper portion of the traine ineniber 7 toproject above the ground level. Consequently the possibility of anyperson falling through the manhole .trame t when the cover l2 has beenremoved, is reduced to a minimum.

l claim: a device of the class described, a trarne ineinber formed withan inwardly extending annular rib positioned at a spaced distance treinthe upper edge thereof, a closure for said. trarne nieniber arranged torest upon the upper sui-tace oi said annular rib, said closure beingprovided with a boss at its outer edge, said boss having a slot adaptedto receive said i.ib,wvliei'eby a portion ot the boss underlies thelatter when the closure is in operative position, said closure beingalso provided with an integral guide keeper deviending' from the lowersurface thereof below the plane of said rib, and positioned at pointdianietrically opposite saidL boss, a l oclringr ineinber carried bysaid closure and guided by said keeper, said looking rnernbei' being`arranged tor nioveinent into and out oit operative engagement with theunder surface ot said rib, and means extending vthrough said closure andoperable at will Leon esciivvnin

